Tiguisselt S of Tata was one of the important localities in the eastern Dra Valley which
  BENSAID (1974) included in his classical study of late Givetian Moroccan ammonoids
  which, at the time, were partly placed in the basal Upper Devonian.  However, a
  detailed description of the ammonoid-rich succession has not been given previously.
  The section was also visited by H. HOLLARD who noted sample levels of late Eifelian
  and Givetian age in the compilation published (after his death) in 1981.  Translated
  into modern taxonomy, the following ammonoids have been illustrated by BENSAID
(1974):

  Atlantoceras tataense (pl. 1, figs 4, 4b, 6)
  Agoniatites meridionalis (pl. 1, figs 51 5a, as cf.
  meridionalis, pl. 1, figs 9, 9a, the holotype)
  Agoniatites costulatus (pl. 6, fig. 5)
  Wedekindella lata (figs 24a-bl, pl. 5, figs 8, 8a)
  "Phoenixites" n. sp. (figs bl-b2, 24f, as Tornoceras
  simplex)
  "Trevoneites " assesi (fig. 24d, pl. 5, fig. 12, as Tornoceras
  westfalicum)